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Loans - Credit risk profile by risk grade of acquired credit impaired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Loans |  |
Total loans | $ 11,375,104 | $ 11,290,147
Construction and land development |  |
Loans |  |
Total loans | 1,017,261 | 1,025,387
Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 1,386,327 | 1,261,527
Consumer | Consumer |  |
Loans |  |
Total loans | 663,422 | 654,883
Acquired credit impaired loans |  |
Loans |  |
Total loans | 361,846 | 396,032
Acquired credit impaired loans | Pass |  |
Loans |  |
Total loans | 218,364 | 238,772
Acquired credit impaired loans | Special mention |  |
Loans |  |
Total loans | 58,281 | 62,177
Acquired credit impaired loans | Substandard |  |
Loans |  |
Total loans | 85,201 | 95,083
Acquired credit impaired loans | Construction and land development |  |
Loans |  |
Total loans |  | 26,930
Acquired credit impaired loans | Consumer |  |
Loans |  |
Total loans |  | 36,812
Acquired credit impaired loans | Commercial and industrial |  |
Loans |  |
Total loans |  | 8,112
Acquired credit impaired loans | Commercial loans | Real estate |  |
Loans |  |
Total loans | 130,938 | 149,134
Acquired credit impaired loans | Commercial loans | Real estate | Pass |  |
Loans |  |
Total loans | 108,762 | 121,264
Acquired credit impaired loans | Commercial loans | Real estate | Special mention |  |
Loans |  |
Total loans | 6,465 | 9,064
Acquired credit impaired loans | Commercial loans | Real estate | Substandard |  |
Loans |  |
Total loans | 15,711 | 18,806
Acquired credit impaired loans | Commercial loans | Construction and land development |  |
Loans |  |
Total loans | 25,032 | 26,930
Acquired credit impaired loans | Commercial loans | Construction and land development | Pass |  |
Loans |  |
Total loans | 17,756 | 18,978
Acquired credit impaired loans | Commercial loans | Construction and land development | Special mention |  |
Loans |  |
Total loans | 2,904 | 3,018
Acquired credit impaired loans | Commercial loans | Construction and land development | Substandard |  |
Loans |  |
Total loans | 4,372 | 4,934
Acquired credit impaired loans | Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 7,029 | 8,112
Acquired credit impaired loans | Commercial loans | Commercial and industrial | Pass |  |
Loans |  |
Total loans | 5,160 | 5,703
Acquired credit impaired loans | Commercial loans | Commercial and industrial | Special mention |  |
Loans |  |
Total loans | 286 | 471
Acquired credit impaired loans | Commercial loans | Commercial and industrial | Substandard |  |
Loans |  |
Total loans | 1,583 | 1,938
Acquired credit impaired loans | Consumer | Real estate |  |
Loans |  |
Total loans | 163,359 | 175,044
Acquired credit impaired loans | Consumer | Real estate | Pass |  |
Loans |  |
Total loans | 82,203 | 88,131
Acquired credit impaired loans | Consumer | Real estate | Special mention |  |
Loans |  |
Total loans | 35,968 | 36,901
Acquired credit impaired loans | Consumer | Real estate | Substandard |  |
Loans |  |
Total loans | 45,188 | 50,012
Acquired credit impaired loans | Consumer | Consumer |  |
Loans |  |
Total loans | 35,488 | 36,812
Acquired credit impaired loans | Consumer | Consumer | Pass |  |
Loans |  |
Total loans | 4,483 | 4,696
Acquired credit impaired loans | Consumer | Consumer | Special mention |  |
Loans |  |
Total loans | 12,658 | 12,723
Acquired credit impaired loans | Consumer | Consumer | Substandard |  |
Loans |  |
Total loans | $ 18,347 | $ 19,393

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